This study established key factors causing deck slab deterioration based on GPR database of 747 highway bridges, and predicted deck slab damage rates with respect to bridge service life. To minimize the influence of bridge service life on deck slab deterioration, the deck slab damage rate database was corrected based on a linear regression model of bridge service life vs. deck slab damage rate. The corrected deck slab damage rates were analyzed to determine correlation considering the number of snowy days, the amount of snowfalls, the number of freeze-thaw days, average winter temperature, altitude, the amount of deicing chemicals and equivalent traffic volume, and then both the number of freeze-thaw days and the amount of deicing chemicals were determined to be key factors causing deck slab deterioration. The complex deterioration considering both key factors was represented deck slab damage rate charts, and the average deck slab life was derived. The results of this study will be used as a guideline for highway bridge maintenance to identify the progress of deck slab deterioration for a given bridge and predict the time required deck slab rehabilitation.

1. 서 론
 2. 교량 바닥판의 열화도 측정
  2.1 바닥판 열화도 측정 장비
  2.2 바닥판 상태등급 산정기준과 유지관리전략
  2.3 바닥판 열화도 데이터
  2.4 공용연수에 대한 바닥판 손상률의 보정
  2.5 바닥판 열화인자
 3. 바닥판 손상률 분석
  3.1 바닥판 손상률과 열화인자 상관도 분석
  3.2 바닥판 손상률 추정
 4. 결 론
 감사의 글
 References

• 이일근(정회원, 한국도로공사 도로교통연구원 책임연구원) | Il-Keun Lee
• 김우석(정회원, 충남대학교 토목공학과 조교수) | Woo-Seok Kim Corresponding author
• 강형택(정회원, 한국도로공사 도로교통연구원 수석연구원) | Hyeong-Taek Kang
• 서정욱(정회원, 한국도로공사 구조물처 과장) | Jung-Wook Seo